Everclear is a pure grain alcohol. The brand, produced by David Sherman Corporation, comes in two strength bands, both 95% (190 proof), and 75.5% (151 proof) bottles. Although, the 95% is undeniably the most popular and most available type.
Many of the US provinces have made it illegal to buy Everclear and it's very uncommon to see the most potent of the Everclear products sold outside of America.
And it's for good reason too. Everclear is incredibly potent and should be used strictly and responsibly. Don't drink it straight!